Effects of nitrogen stress in grass swards on evolution of ground cover and spectral characteristics of leaf strata

A.G.T. Schut; J.J.M.H. Ketelaars

doi:10.1117/12.454194

28 January 2002 Effects of nitrogen stress in grass swards on evolution of ground cover and spectral characteristics of leaf strata

A.G.T. Schut, J.J.M.H. Ketelaars

Author Affiliations +

Proceedings Volume 4542, Remote Sensing for Agriculture, Ecosystems, and Hydrology III; (2002) https://doi.org/10.1117/12.454194
Event: International Symposium on Remote Sensing, 2001, Toulouse, France

Abstract

The effects of nitrogen (N) application level on temporal development of ground cover (GC) and reflection curves of leaf strata within the canopy were studied with an experimental imaging spectroscopy set-up. This set-up has a high spatial (0.16-0.26mm²) and spectral resolution (5-13 nm) within the 405-1650 nm range and can distinguish leaves in height and leaf angle related intensity classes from 1 meter distance. Between June and late October 2000, a greenhouse experiment was conducted with Lolium perenne L. mini swards with 5 N treatments (0, 30, 60, 90, 120 kg N per cut), 4 cutting dates and 3 replicates. Images were recorded twice a week. Ground cover of green material increased up to cutting dates. Nitrogen treatments could be separated by development of GC and the width of the broad chlorophyll absorption band of leaves around 680 nm (CAW), with small changes in GC and CAW for the 0 N and large changes for high N treatments. Two weeks after cutting, CAW reached its maximum with a subsequent decrease for the lower N treatments in the last week before cutting. The width of the CAW showed a unique relation with the relative yield deficit for all cutting dates (R²equals0.95). Changes in edge position with vertical position in the canopy were stronger for blue edge and green edge when compared to red edge. Darker green leaves were present at the bottom of the canopy and lighter green leaves at the top.

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A.G.T. Schut and J.J.M.H. Ketelaars "Effects of nitrogen stress in grass swards on evolution of ground cover and spectral characteristics of leaf strata", Proc. SPIE 4542, Remote Sensing for Agriculture, Ecosystems, and Hydrology III, (28 January 2002); https://doi.org/10.1117/12.454194

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KEYWORDS

Sensors

Nitrogen

Absorption

Imaging spectroscopy

Photons

Reflection

Soil science

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